Hi,
I had to get ODM to work in a Solaris 10 container (aka zone) and wanted to make sure that Oracle did indeed use ODM and direct I/O to the Oracle files. I could not find documentation for the Veritas dtrace probes but after some trying and guessing the following dtrace script turned out to be helpful.
#!/usr/sbin/dtrace -s
#pragma D option quiet
fbt:odm:odm_vx_*io:entry
/!self->trace/
{
self->trace = 1;
}
fbt:vxfs:vx_dio_rdwri:entry,
fbt:vxfs:vx_dio_check:entry
/self->trace/
{
printf("%s %s\n", probefunc,
stringof(((struct vnode *)
((struct vx_inode*) arg0)->i_vnode)->v_path));
}
fbt:odm:odm_vx_*io:return
/self->trace/
{
self->trace = 0;
}
The vx_dio_check probe seems to trigger whenever IO takes places via ODM. When the IO is not cached, i.e. via Cached Oracle Disk Manager, the vx_dio_rdwri probe also triggers.
Example:
vx_dio_check /zones/ora/root/orcldata/bodm1/control02.ctl
vx_dio_rdwri /zones/ora/root/orcldata/bodm1/control02.ctl
vx_dio_check /zones/ora/root/orcldata/bodm1/control01.ctl
vx_dio_rdwri /zones/ora/root/orcldata/bodm1/control01.ctl
vx_dio_check /zones/ora/root/orcldata/bodm1/system01.dbf
vx_dio_rdwri /zones/ora/root/orcldata/bodm1/system01.dbf
vx_dio_check /zones/ora/root/orcldata/bodm1/example01.dbf
vx_dio_check /zones/ora/root/orcldata/bodm1/example01.dbf
vx_dio_check /zones/ora/root/orcldata/bodm1/control01.ctl
vx_dio_rdwri /zones/ora/root/orcldata/bodm1/control01.ctl
I had caching enabled for example01.dbf via CODM so we don't see the vx_dio_rdwri probe for the exampl01.dbf, only the vx_dio_check probe.
This is for Storage Foundation 5.1SP1 Solaris x64.
Perhaps someone finds this useful. Generally my impression is that ODM is a very useful performance feature that most people have licensed but which nevertheless is seldom used.
